Electrical attachment plug



Feb. 14, .1928. 1,659,447

. C. F. SMITH ELECTRICAL ATTACHMENT PLUG Filed March 18. 1926 Patented Feb. 14, 1928.

UNITED STATES PATENT OFFICE.

CHARLES 1. SMITH, or NEW BRITAIN, CONNECTICUT, Assrenon To LAmnms, FRARY a CLARK, or NEW BRITAIN, CONNECTICUT,.-A CORPORATION or con- NECTICUT.

ELECTRICAL ATTACHMENT PLUG.

Application filed March 1a, 1926. Serial No. 95,732.

This invention relates to electrical attachment plugs of the type having a body portion provided with contact members conne'cted-to the ends of flexibleqconductors or 1y, one using the plug will carelessly pull or jerk onthe conductor when it is desired to detach the plug from the utensil, and, when the plug is used in connection with a sad iron or similar article, the cord is subjected to sudden jerks whenever the iron is moved as far as the conductor will reach.

The ai of the resent invention is to provide 2;? improve and simple attachment plug wherein the connections between the conductors and the terminals within the plug are relieved of excessive strains in a very.

effective and economical manner.

In accordance with the present invention, the plug body is provided with passages for the respective connectors or cords, and these passages are provided with transversely extending ridges so arranged that the cords are bent more or'less sharply over the same, with the result that, when a pulling force is exerted on the cords, the strain is more or less taken up by the ridges and, to thatextent, the connections between the cords and the terminals are relieved. Preferably, the plug body is in two parts, and-these parts are identical in all particulars, this being of advantage in that there is a considerable saving in manufacturing and carrying charges, it being possible to construct the .parts of the plug body from the same molds and to furnish both parts from the same supply.

Otherobjects will be in part obvious and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the appli- '0, a, the flexible connectors; d, d, the tercation of which will be indicated in the appended claims.

In the accompanying drawings, wherein I have shown, for illustrative purposes, one of the embodiments which the present invention may take:

Figure 1 is a perspective view looking at the inside surfaces of the two parts of the plug body, the parts being in the partially open posltion shown in F1g. 2;

Fig. 2 is an end view of the parts as. shown in Fig. 1;

Fig. 3 is a plan view of one of the parts of the plug body;

Fig. 4 "s atransverse sectional view through the assembled lug body, this view 70 g eing taken substantially on line 44 of Fig.5 is a view similar to Fi 4.- with the section taken on line 5-5 of ig. 3;

Fig. 6 is a lon itu'dinal sectional view through the assemb ed lug body, this view being taken substantially on line 66 of Fig. 3; and

Fig. 7 is a view of the complete attachment plug with a portion of one of the parts of the plug body broken away for purpose of illustration.

Referring to the drawings in detail, a and b designate the two parts of the plug body;

minals, the latter being shown in dotted u lines, as the particular construction thereof forms no part of the resent invention; e, a sprin connected to t e plu and through which t 1e connectors pass; an f, f, the usual bolts for securing together the two parts of the plug body.

The two parts a and b of the plug bod are preferably identical in construction an as they are so shown in the accompanying 0o drawings, a description of one will apply to the other. Each of these parts has, in its inner face, a pair of recesses 10 ada ted to accommodate the terminals 11, and c annels or grooves 11 and 12 leading from the 10 respective recesses 10 to an opening 13 through which the cords lead into the plug body. The recesses 10 and the channels 11 and 12 are symmetrical with respect so the medial longitudinal line of the plug part so that, when the parts are placed face to face, the channels register so as to form passages through which the cords I: extend.

Each of the channels is preferably reversely curved longitudinally so as to make the passages more or less tortuous in the plane of the meeting faces of the parts. Each of the channels is provided with one or more transversely extending ridges or high spots and one or more hollows or depressions and, preferably, the ridge or ridges of the channel 11 is offset or staggeredly arranged with respect to the ridge or ridges of the channel 12. In the present illustrative disclosure of the invention, the channel 11 is provided with a transversely extending ridge 15 and a depression 16; and the channel 12 has a depression 17 transversely alined with respect to the ridge '15 and a ridge 18 transversely alined with respect to the depression 16.

When the two parts of the plug are placed face to face, as shown in Figs. 4, 5 and 6, the ridge 15 of the channel 11 of each part is opposed to the depression 17 of the channel 12 relieving the connections between the cords and the terminals. It will thus be observed that the cords are held in place in such manner that the connections between the cords and the terminals are greatly relieved of any pulling strains without the objectionable use of separate clamping devices or knots.

Since the parts of the plug body are identical in all respects to one another, these parts may be made from the same mold, and it is not necessary to manufacture or carry in stock two parts of different construction in )rder to make up the plug body, which means that there is a decided saving in manufacturing and carrying charges. Also, since the two parts are identical, and whenplaced face to face upon one another the channels must properly register with the ridges in the desired relation, no confusion or error can re' sult in assembly, and the act of assembling the parts is greatly facilitated.

As many changes could be made in the above construction and many apparently I widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be two parts areassembled, whereby the ridges interpreted as illustrative and not in a limit- 7 6 ing sense.

It is also to be understood that the language used in the following claims is in tended to cover all of the generic and specific features ofthe invention herein described and and all" statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

1. in an electrical attachment plug, a body portion formed of two like parts identical in size and shape, each of said parts having a pair of symmetrically positioned channels and each channel having therein a transversely extending ridge which ridges are out 7 of line transversely to each other, whereby when said parts are assembled, the ridges in the registering channels are offset and longitudinally spaced from each other.

2. In an electrical attachment plug, a body portion formed of two like parts, each part having a pair of symmetrically positioned channels provided with transversely extending ridges, the ridges in said part being in relative transversely offset positions, where- 8 by when the said parts are assembled the ridges in the registerin channels are disposed in longtudinally 0 set relation.

3. In an electrical attachment plug, a body portion formed of two like parts, each part 9 having a pair of symmetrically. positioned channels provided with transversely extending ridges, the ridges in said part being in relative transversely offset positions and the channels having depressions therein at the sides of the ridges, whereby when said parts :are assembled the ridges in the registering channels are disposed in longitudinally offset relation and the depressions register with the ridges in the registering channels.

4. In an electrical attachment plug, a body portion formed of two like superposed parts, the meeting faces of .said parts having registering recesses and registering channels therein, terminal members in said recesses, and flexible cords connected to said members and extending through the channels, the channels in each part having transverse ridges therein with the ridges offset transversely from each other and the channels further having depressions therein at the sides of said ridges, toregister with the ridges of the registering channels when the are adapted to depress portions of the flex- 1 ible cords into the depressions and clamp the cords rigidly in the plug.

CHARLES F. SMITH. 

